> Or, for a much more complete picture, you can measure the change in > crown at all accessible ribs! That's what I do. You get dirtier and say > more nasty words, but you sure get a great picture of what is happening > down yonder. I tape a string at one end of the panel near a rib and hold > it to the panel at the other end of the rib. Then I use a series of > little feeler-gauge wooden blocks that I made up (in half-millimeter > increments) to see which one will just fit between the string and the > panel bottom. Or a wedge, with increments marked off along it's face so you only have to keep track of one tool. >I do that at all accessible ribs both before pre-stressing > and with the board loaded. > > The first time I did that was a MAJOR "Ahh-Ha" moment for me! Neat, ain't it? Ron N
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